The mistake people most often make when trying Rotary Carpet Cleaning for the first time is that they wrongly expect a standard bonnet pad to give them good results. It won't. If you just pre-spray, then buff with a pad and some solution, you won't get good results. (Just the same as if you just pre-sprayed and extracted with HWE you wouldn't get good results).
It's vital to have a strong source of agitation. If you have an Envirodry, an old HOST machine, even an Oreck with the Brush (too small really) that's good. Nothing (in my opinion) beats the 'Restore Brush' from Dry Fusion but as it only fits the DF machine, it's of no use for someone with a standard rotary.
If you don't have a CRB machine, don't have a DF Restore Brush, the next best thing (in my opinion) is an XR Grey Pad from SolutionUK.
Considering the above, here's my workflow, and I have genuinely restored some trashed end of tenancy carpets with this approach:
1. Thorough Pre-Vac (there's no argument that it's optional in rotary cleaning),
2. Pre-Treat any spots that I think the cleaning process may need help with (ie.. those requiring solvent treatment etc). Any that needed a lot of work, I will use a small CFR spotter to extract rinse them (see, I'm not adverse to water extraction! Rare though).
2. Light to medium pre-spray with a solution that is powerful but doesn't need rinsing. I use either M-Power, Fusion Clean, or Activator (if doing Dry Fusion process).
3. Five minutes dwell prior to agitation. (Good time to get the machine out of the van).
4. Thorough N/S/E/W agitation using either DF Restore Brush (synthetic or low wool mix) or a HOST CRB machine, using gold brushes (wool or thick cut pile). I never rush this stage; it's the real cleaning stage, especially with Rotary Cleaning. The spot areas may get some extra pre-spray and extra brushing. If you don't have a CRB machine, then this is where you'd use the XR Grey Pad on your rotary. Almost as effective.
5. Mix up HOT solution in the bucket and put in the first pad. Leave in for 2 mins then thoroughly wring out.
6. Place on carpet, in an open area that I am going to be able to manouvre around quickly. Obviously most of the solution is going to leave the pad in the first few seconds of action, so it is VERY important to move quickly with the rotary and spread out the solution evenly.
7. Lower the machine onto the pad and as above, move quickly to spread the solution. I only ever work on an area of 20m2 at a time, with 1 pad. Work back over the area, evenly working the solution.
8. Flip over the pad and go over the same area again. With the DF machine this side of the pad will be hot & dry from the blower so it will greatly help absorb the soil and dry the carpet.
9. Repeat the process for all areas of the carpet.
10. Thorough post-vac. This helps reset the pile and also picks up any loose debris, dirt and loose fibres. (rare).
11. Groom with a brush. Result = lovely clean, fresh, stain-free, stain-blocked, de-odourized carpet.
Cheers,
Dave.